Photographic shutter.



R. KROEDEL.

PHOTOGRAPHIU SHUTTER. APPLICATION FILEQ AUG.17, 1908. Qgrg@ Patented 001;. 19, 1909.

4 SHEETS-SHEET 1.

R. KROEDEL.

PHOTOGRAPHIG SHUTTER.

APPLICATION FILED AUG. 17, IQO.

' Patented Oct. 19, 1909.

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R. KREDL.

PHOTOGRAPHIC SHUTTER.

APPLIGATION FILED Ana-17, 1908.

@@jgu Patented 0011519, 1909.

4 SHEETSO-SHEBT 4. v

being broken away ROBERT KROEDEL, OF ROCHESTER, NEW YORK, ASSIGNOR TO EASTMAN KODAK C0., OF

ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

PHOTOGRAPHIC SHUTTER.

Specification of Letters Patent.

Patented Oct. Titi. i905?.

Application led August 17, 190-3. Serial No. 448,806.

To eli whom i 'may concern:

Be it known that I, ROBERT KRonnEL, of Rochester, in the county of Monroe and State oi' N ew York, have invented certain new 'and useful Improvements in Photo- `raphic Slmtters;a11d I do hereby declare the ibllowin'n` to be a full, clear, and exact description of the sain-e, reference being had to the accompanyingI drawings, :toi-1111110 a 3 part oi the specification, and tothe re erence clraracters marked thereon.

My present invention raphy, and it has for its object to provide a shutter oi the curtain type which will be oi' 1 sii-nple construction and convenient as to its methods of operation and which will provide for a closing of the shutter aperture duringr the resetting movement of the cur- `ta1n a protection of the film.

'My improvements are further directed to the controlling devices for the shutter actuating mechanisin whereby the exposures are prearranged and toward a simple and convenient arrangement thereo To these and other ends the invention consists in certain improvements and conibinstions of parts all as will be hereinafter more -t'ully described, the novel features being pointed out. in specication.

in the drawings: Figure l is an exterior view of the casing of a shutter constructed in accordance with and illustrating one einbodiment of my invent-ion, being a plan of the side of thecasing upon which the shutter controlling devices are mounted.

the claims at the end of the the shutter and casing. vation of the casing, with the back removed the curtains being omitted. Fig. l is a. transverse section on the line 4-4 of Fig. 3. Fig. 5 is a view 'corresponding to that of Fig. 2, but ony an enlarged scale, the casing and the curtains being occupy when an exposm the position they mg movement ot' the shutter has been coin pleted. Fig. G is a similarview with the curtains in the positions they occupy when the shutter aperture is about to be formed. Fig. 7 is an enlarged fragmentary elevation of the inner sides of the curtains and Ian adjacent portion of the guide vtherefor showing' the manner in which their 'opposed edges are separated to forni an exposure opening. Fig. 8 is a simile-r Viewv after the separation relates to photogl Fig. 2 is a longitudinal central section through' Fig. 3y is a rear ele"` has been e-i'ected. Fig. t) is a rear eleva-tion oi' the shutter bet'ore an exposure. Fig. l0 is a similar view showing the curtains in the positions they occupy duringl a :time `exposure. Figi ll is an enlarged detail side elevation of the curtains showing their inter locking devices. Fig. 1:2 is a transverse section of the same. taken substantially on the line 12--12 of Fig. ll. Fie', 13 is a similar transverse scctiombut taken substantially en the line 13e-13 of Fig'. ll. Fig. le is a longitudinal det-ail section, enlarged, of the interlocking edges of the two curtains. Fig. is an exterior' view of the journal plate which carries the controllingl devices for the shutter actuating;l mechanism, the said devices being set for a time exposure. Fig. 16 is a section taken coincident with the under 'tace of said plate. Fig. 17 is a view o t the underside of the plate, with 'the mechanism attached and the parts thereof in the positions the)7 occupy when the shutter is set for a tiene exposure. Fig'. 18 is asimilar view with the parts in the position they occupy during.; a time exposure. Fig. 19 is a similar view with the parts in the position .they occupy after an exposure has been effected, the shutter being set for instantaneous work. Fig. 20 is a transverse section .through the controlling mechanism, take-n substantially on the line 20-20 of Fig. 17, and Fig. 21 is -a detail transverse section through a portion of the shutter casing showingthe tension members of' the ,actua-tingmechanism in longitudinal. section.

'Similar reference characters in the several figures indicate similar parts. ,Y v n the present instance i have shown a shutter casinfJr l (Figs. l, 2, 3, and 4) which also forms tno camera casing being,` constructed with the usual central bellows chainherl und film spooi chambers i3 and t uponr either side thereof, the film being fed in the usual manner over guide rolls 5 past an exposure opening 6 in the camera shutter casinY formed in a plate 7. The ends ofthe casing 8 are preterablyhingcd at their tor# ward edges, as at 9, while the opposite or rear edges :are provided with rabbets 10, are also the corresponding edges of the riemaining walls oit the casing to cooperate with the back ik'. or simileriy iitted tihn or plate holder, the construction ljust described, being such as to gire-convenient and im` mediate access to the interior parts.

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,55 a continued and independent eem/ie ein is regulated by the operator neans devices to be hereinafter de- "bed To elect an exposure th'e winding ller lil is new released whereupon the two rtains move in the opposite direction yacross the field of exposure through the action et the tension rollers 16 and 17, and curtain B being' in advance is arrested by Q the stop after having crossed theexposure opening,- 6' in the camera and before curtain A has completed its travel. 'But the cams 33 adjacent Ythe stop 32 act instantly to release the clamping members 28 permitting movement of curtain t until the abutments 31 on the latter have engaged the spring abutments 30 and the two curtains are again overlapped and ready tb he reset as before. For a time exposure the separation of the curtain is made so ffreat that curtain B will have coms travel before curtain A starts to the aperture G, as shown in Fig. 10, ns being`y` provided for arresting the shutopposite the exposure opening` and subse intently releasing curtain A, all as will be described.

Referring .moreparticularly to Figs. 1 and to :20, l will now proceed to describe devices for regulating the shutter actuating mechanism including means for regulating the width ot the shutter aperture. These devices may be carried upon a'wall of the shutter casing 1, but l prefer to mount them upon a plate 3l secured to the latter and in whieh .the shaft ot' the winding roller 19 joui1naled-` Adjacent to its journal the shaft 35 carries a pinion 3o which meshes with a gear 237 carried on a shaft 38 supported between the plate 234; and a housing and terminating' on the outside oi the and exterior-ly ot the casinaF in a wind.-

linob ett). IThe sha-tt 38 also-carries,l ined with the 2ggear 37, a ratchet. 41 and a gear livoled at Zlil onthe under side or the plaie 3 is a master lever til to which is i n d at Ai5 a pawl etti that norhe ratchet l t1 through the tension ning I but is moved out of cooperative relation therewith upon the os- 'in of the lever. A pin 48 on the master lever projects through a slot 49 in the journal plate Se and within acam slot v50 (Fig. 15) in a releasing lever 51 that is lhe amount of this further wind-` this positionwith the shutter aperture curtains must take reciprocated on the center 52 to vibrate the master lever- 4A, as will be understood While a pin4 53 on the releasing lever projecting through a slot 5l in the plate Set forms a means of attachment 'for one end of a spring 5f that tends to hold the releasing lever in a position to retain the pawl 47 on the master lever in engagement with the ratchet 41, the parts being so arranged that the ratchet prevents thn'e unwinding of. the roller 19 under the influence ot the tension roller. Mounted on a stud 56 on the under side of the plate 34 is a toothed disk 57 which meshes with the gear 42 on the shaft 38 and is, therefore, movable with the winding roller. lhis disk is provided upon one side with a plurality of abutments 58 spaced both radially and circnmferentially of the disk relatively to each other and formed, in the present instance, by the serratededve of a plate 59. A leyer 60 pivoted at 61 to t 1e plate 341 carries stop pin 62 adapted to cooperate with the abutment-s 58 and the pivot of the lever (50 is so arranged that the stop is permitted a movement radially of the disk and is adapted to selectively engage the abutments thereon to halt greater or less amount of travel, the abutmentv nearer the centerof the disk allowing greater travel of the latter than that nearer the periphery,; as shown in Fig. 16. The end of, the lever`60 is Apreferably oilset so as to project through a slot 63 in the plate Stand cooperate in the capacity of an indicator with index characters .64 marked on the plate adjacent vto said slot. Having in mind the manner in which the curtain aperture is regulated in size it will be seen that guided by the index 6ft the operator can set the. stop (52 in different positions for engagement. with an abutment 58 igi either an advancedy or rearward position relatively to the 'travel of the. disk 57, and the latter being always movable. with the winding roller 19, curtain A is separated from curtain B to more. or less extent. The disk 57, it will be remarked, in the embodiment of the inven` tion hereinshown, is so proportioned as to make less than a complete revolution' during the most extreme winding movement of the curtain and the stop G2 will, therefore,

its rotation after a engage the abutting' plate 52;) only from one,

and that the serratedside. For an instantaneous or automatically timed exposure the curtain is released. by a single movement of the releasing lever 51 which causes the master lever i to operate the' pawl t6 out of engagement with the retamnrgl ratchet Ll1 and the exposureiis completed in" one operation ot' the shutter actuating mechanism, but for a time exposure the unwinding of the place intermittently and toetet this l provide the following means: Pvot'ed on the disk 57, preferablyfupon the same center as shown, is a pawlor stop 65 30 referred foi' :l time ezipome, the curtains bum@ LL an 35 up on iii@ wimiiiig wila.' ns siwwi n! Fig. which rifgsy d but also having: an imi asini,

i ti ixiciizii sii' mmm i :ind Gi' mi iii@ facs 0i t-L i1 5 boing .uoiiiiuiiy iiiiiii :i

which is in advance iin is unwiniing if by a. Spr i f A laici to the pi Sli ai. i() n. i

` portion 'a mi tim and thai-@0f if'ii'i ubi@ imo im mili 05"; f; mio ivm pfui una :mi stop7 mi@ inward iii@ can :1s sii.

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in Fig. 17 ibi; garb; :we Show before iic imagine pif'iimi i2 of @mitm-in i the bind/i f und cm: in Hei-iii ai'. mi and shown allows: yciasm n 'be teneiimi @E ments 50 211MB). Liereoi i i, 1 .in im 30s# i ma :uid men., naw-m im retainingl them in closed relation during a resetting movement ot the shutter, the en- `c'ageinent ot the abutments bein@ such as to permit the advance curtain to be reWound through the medium of the other.

2. l'n a photographic shutter, the combinationwith tivo curtains having;r relatively adjustable edges defining the exposure opening and meansI tor operating the curtains simultaneously across the eld of exposure in either ot' two directions, ot means for arresting the advance curtain during the exposure movement of the shutter until the other has inoved relatively thereto to close the 'exposure opening, automatically interlocking projecting abutments one on each of the tivo ciirtains tor retaining' them in closed relation during' a resetting' movement of the shutter, means for arresting' the advance curtain during; auch movement and means 't'or automatically releasing' the abutments to permit. the.

other curtain to continue relatively t the tirs-i to reestablish thc opening` in the shutter. 1

3. ln a photographie shutter, the combination with a casing' provided with guides, of two curtains having' relatively adjustable edges detiningr the exposure opening, means tor operating' the curtainsl simultaneously across' the ticld ot exposure, clamping ineinbers upon one ot the curtains engaging u on opposite .sides ot the other end of the guides on the casiim'. means tor arresting one of the curtains and means tor simultaneously rej leasing the clamping members to permit the other curtain to continue relatively thereto to change'y the shutter opening.

il.. in a photographic shutter, the con'ibination with a casing provided with a guide having' a stop on one side thereof and a cani on the other, ol tivo curtains. having relatively adjustable edges defining' the exposure opening', means t'or operating thc` curtains simultaneously across the field of exposure and tivo cooperating clamping' inembers on one ot' theni engaging upon opposite sides of the other and oit the guide, one ot said members being adapted to engage the stop and the other to be released from the iirst by engagement with the cam to prevent a relative movement et the curtains.

ln a photographic shutter, the combination with a curtain and a winding i'oller therefor` ot means :t'or limiting the winding' .movement ot' the curtain. comprising' a disk j rotatable with the, roller and provided with a series ot' abutments spaced relatively to each other` both radially and circumferentially ot' the disk and an adjustable stop adapted to selectively engage the abutincnts.

6. in a photographic shutter. the combination'ivith a curtain, and a winding' roller therefor, of means tor limiting); the windii'in' movement oit the cnrtaiiu comprising-i' a disk rotatable with the roller and provided with l a series ot abutmcnts spaced relatively to each other both radially and circumferentially of the disk and a lever having a rela.-

j tively fixed pivot and provided with a stop j movableradially of the disk into position l for selective engagement with the abutments.

l 7. In a photographic shutter` the combil nation with a curtain. a Windingroller i therefor and a journal plate -tor the roller having an index thereon and a slot adjacent. the index, of means for limiting' the movement ot' thelcurtain comprising),` a disk rotatable with the roller and provided With a series ot' abutinents spaced relatively to each other both radially and ciiciiniferentially ot t'ne disk and a lever pivoted to the journal plate and provided with a stop movable radially of Ithe disk int/o position for selective engagement with the abutments, said lever 'having an otl'set portion extending through the slot in the journal plate and .forming an indicator cooperating' with thc index on the latter.

S. In a photographic shutter, the con'ibination with a curtain and actuating mechanism therefor, ot controlling devices for effecting an intermittent movement of 'the curtain con'iprising a stop movable with and having a limited movement independently of theactuating` mechanisnn yielding meansl i'or normally holding' the stop/at one limit ot its independent movement/a detent movable into and out ot' the path ot' the stop and adapted to engage the latter a'nd bring the actuating:r mechanism to a halt, ywhen the atop has reached the other limit of its movement, means tor lockingl the curtain actuating mechanism and means 'for throwing said locking: means and the detent alternately into and out ot opei'ativc position.

'9. l'n a photographic shutter, the combination with a curtain and actuating mechanism therefor. ot' controlling devicesfor effecting' an intermittent movement ot the curtain comprising' a member movable with j the roller. a .stop carried b v said member and having' a limited movement relatively thereto. yielding' means tor normally holding,r the stop at one limitot' its movement, a detent.

movable into and out ot' the path ot the stop and adapted lo engage the latte' and bring),l thc actuating' mechanism to a halt. when the xatop has reached the other limit ot itsl movei nient` means toi' loclv'ing' the curtain actuating mechanism and lucana for throwing said lockingjmeans and the dctent alternately into and ont ot operative position.

l0. ln a photographic shutter, the combination with a curtain and actuating' mechanism thcretor` ot controlling devices t'or` ctl'ccting' an intermittent movement ot the curtain comprising' a disk -driven bv the actuating mechanism and provided with two abutincnts. a .stop pivoted on the disk and i movable relatively tlicrcto between the abuttti) nimma ign? m e1. A

means AS d movemsnt 1m mechanism, j;

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movable mw nu und adap the ma lockn' 5 cu mn havm of 

